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there seems to be a problem going on with the site, list of questions are not being updated, and some of them are dissapearing, like this one:
Does positronium have a stable crystalline phase?
This was a side-effect of our database migration. We had to rebuild a few services after it, so things were down for a while.
Should be all good now!
There is some maintanance of the Stack Exchange servers going on. There were notices on the sites for a while. Presumably everything hasn't gone perfectly smoothly.